ABSTRACT Purwoko, Samantha. 2014. Code-switching and Code-mixing of Local English Teachers of Tenth Grade English Classes at Stella Maris Catholic Senior High School Surabaya. S1. Thesis. English Department Faculty of Language Education and Letters. Widya Kartika University Surabaya. Advisor I: Drs. Triyanto Siswantono, M.Pd. Advisor II: Yulius Kurniawan, S.Pd., M.Pd. Nowadays, many people …